In their fourth and final article in the series, DevShed has posted Object Interaction in PHP: Introduction to Aggregation, Part 4.

In the fourth and final article in our series covering aggregation in PHP, Alejandro Gervasio reviews the MySQLConnector and Pager classes. He then uses these classes first to build a simple database, then to display some paged results from the database.

They tie it all together in part four, showing you how to take the classes that you've worked through the other parts ith and make something useful out of the principles of object aggregation and interaction...